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Potato Tuber Moth ( Phthorimaea operculella )

Potato Tuber Moth ( Phthorimaea operculella ). POTATO TUBER MOTH. Order : Lepidoptera Family : Gelechiidae Distribution : Cosmopolitan-tropical and subtropical Host : Potato, tomato, eggplant, tamarillo leaves (tree tomato). DESCRIPTION. Narrow silver-grey body with

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Potato Tuber Moth ( Phthorimaea operculella )

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  1. Potato Tuber Moth (Phthorimaeaoperculella)

  2. POTATO TUBER MOTH Order: Lepidoptera Family: Gelechiidae Distribution: Cosmopolitan-tropical and subtropical Host: Potato, tomato, eggplant, tamarillo leaves (tree tomato)

  3. DESCRIPTION • Narrow silver-grey body with • Greyish brown wings marked by small, dark specks • Body length: 10 mm Wings are fringed

  4. DAMAGE • Leaves and tubers

  5. Damage symptoms on leaves

  6. Damage symptoms on tubers

  7. Life-cycle Eggs: laid singly on underside of leaves and exposed tubers 150-200 eggs laid Eggs are small, spherical, translucent, and range in color from white or yellowish to light brown.

  8. Life-cycle Larva: Larva 1-2 mm long and grows through 4 instars to reach 15-20 mm long. All larvae have dark brown head. Larva first mine into leaves and later into stem. Larval period lasts 2-3 weeks in summer. Larvae also excavate tunnels in the tubers

  9. Life-cycle Pupa: Pupa are formed in a silken cocoon covered with soil particles and debris for camouflage. Pupation occurs on dead leaves or on stored potatoes. Moth appears in 7-10 days Life-cycle is completed in about one month. As many as 5-6 generations occur in a year. The moth mainly hibernates in the form of pupae and emerges with the onset of warm dry conditions.

  10. Management • Use clean seed • Destroy tuber moth infested tubers, plant debris and volunteer plants • Do not expose the tubers (earthing up) • Sort out the tubers before storage.

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